CUMINGIA.— Plate II. 



inflato ; latere postico valide arcuatim rostrato, | of Cumingia are all which the genus contains excepting 

 numjine ventmli ante rostrum contracto, margini' \ the t\-pc. 



dorsali vcddi declivi. 



Hargreave's Cumingia. Shell snuiU, subquadrate, 

 smooth ; anterior side very short, slojjed, obtuse, 

 inflated; posterior side strongly beaked \\rith a 

 curve, ventral margin contracted in front of the 

 beak, dorsjil margin much sloped. 



M. Ai>AMS (Thyella). Proc, Zool. So.>,, l.ST.'l. 



Hah. N(>w Hebrides. 



Tlie writer has not seen the typo of Mr. Adams's genus 

 Thyella. The two species included in this monograph 



[A (alii 



(Pig. a. b, Mu 

 I. Cum. testa i. 



losu, posiict' cuneatd, brt 

 maraine dorsali elevato. 



. Brit.) 



■eyidiiriter htiitcl- 

 ' ; antif.e injiatd, e.cpansii, 

 >ntraii convexv. 

 The Calikohn'ian' Cumint.ia. .Sliell irregularly lamel- 

 lated, posteriorly cuneate, short ; anteriorly in- 

 flated, expanded with tlie dorsal margin elevated, 

 ventral margin convex. 

 Coxrau. Journ. A. N. S. Phil., vul, vii, pi. 17, f. 12. 

 Hah. California. 



